Portable electronic device

1. A portable electronic device comprising: a casing having a long axis opening; a rotating shaft disposed in the casing; a driving assembly disposed in the casing, the driving assembly being connected to the rotating shaft; a flexible display wound around the rotating shaft, the flexible display having a first side and a second side opposing each other, wherein the first side is connected to the rotating shaft and the second side is located in the long axis opening; and a supporting member being a rod and having a first end and a second end opposing each other, wherein the first end is fixed to the driving assembly, wherein when the second side of the flexible display moves outward from the long axis opening, the rotating shaft rotates and drives the first end of the supporting member rotate such that the supporting member moves on a back side of the flexible display in a direction from the long axis opening toward the second side of the flexible display.

2. The portable electronic device as claimed in claim 1 , wherein the driving assembly further comprises: a first rotating member connected to the rotating shaft, the first rotating member rotating in a first plane; and a second rotating member engaged with the first rotating member, and the first end of the supporting member being fixed to the second rotating member, the second rotating member rotating in a second plane, and the second plane being perpendicular to the first plane.

3. The portable electronic device as claimed in claim 2 , wherein when the second side of the flexible display moves outward from the long axis opening, the rotating shaft rotates and drives the first rotating member to rotate, and the first rotating member drives the second rotating member and the supporting member to rotate.

4. The portable electronic device as claimed in claim 3 , wherein the supporting member moves from the long axis opening to the second side of the flexible display so as to form a predetermined angle between the supporting member and the rotating shaft, and the predetermined angle is between 80 degrees and 100 degrees.

5. The portable electronic device as claimed in claim 4 , wherein the flexible display comprises at least one fixing member, when the predetermined angle is formed between the supporting member and the rotating shaft, the fixing member is connected to the second end of the supporting member.

6. The portable electronic device as claimed in claim 5 , wherein the supporting member has a connecting portion located at the second end of the supporting member, when the predetermined angle is formed between the supporting member and the rotating shaft, the connecting portion is connected to the fixing member.

7. The portable electronic device as claimed in claim 6 , wherein the fixing member and the connecting portion are magnetically connected to each other.

8. The portable electronic device as claimed in claim 6 , wherein the fixing member is adjacent to the second side of the flexible display.

9. The portable electronic device as claimed in claim 3 , wherein the first rotating member and the second rotating member are respectively a gear structure.

10. The portable electronic device as claimed in claim 3 , wherein the casing further comprises an opening, one end of the rotating shaft protrudes out of the opening.

11. The portable electronic device as claimed in claim 3 further comprising: a coil spring, one end of the coil spring fixed to the rotating shaft, and the other end of the coil spring fixed to the second side of the flexible display.